Furnace-grate



. A. MEADE.

v FURNACE GRATE.

APPLICATION rlLED APR.25,1919.

Patented Mar. 16, 1920( 4 SHEETS-SHEET l.

3mm/nto@ lweyne Made,

A. MEADE.

FURNACE GRATE.

APPLICATION FILED APR. 25,1919. l

Patented Mar. 16,1920.

4 SHEETS-SHEET 2.

A. MEADE.

FURNACE GRATE.

APPLICATION FILED APII. 25, 1919.

Patented Mar; 16,1920.

4 SHEETS-SHEET 3.

/74 wma /IZEA o J A. MEADE.

FURNACE GRATE.

APPLICATION FILED APII.25, I9I9.

Patented Mar. 16, 1920.

4 SHEETS-SHEET 4.-

NIN

.ALVYNE MEADE, OF BLACKHEATH, ENGLAND.

FURNACE-GRATE.

To all l'en/wmy t may conce/Mt lle it known that I. ALwfnn MEADE, a subject oi the King ot Great Britain and `ireland, and a resident oi? Blackheatli, county ot Kent, England, have invented a certain new and useful lniprovement in FurnacefGrates, ot which the following is a specification.

This invention, which relates to improvements in furnaces and grates therefonis specially applicable to the type ot Jfurnace commonly employed in conjunction with gas- \vorl s retort settings.Y but also applicable i to furnaces el? any-hind in which solid fuel is used..

The object et my invention is to construct a furnace with a. grate which cannot be displaced during the operation of raking the tire, while any one ot the hangerbars may, it and when necessary, be removed by a slight 'forward movement, and which shall, b v` the introdiution under the fuel bed, of air injected b v means ot' a jet of high or lovv pressure steam, be kept cool Without the` necessity tor any system ot Water cooling. y

A 'further advantageot my invention is that vthe construction of the grate combined with the injection oi air reduce-s the formation ot clinlger, and with some tue-ls low in ash content, practicallxr avoids its formation altogether. y

In the ordinary form of step grate the fuel is supported by a series ot flat plates each one of which is placed slight-ly in advance ot the one above it. In my improved grate, specially designed cast-iron hangerbars are employed instead of the Hat plates, and these hanger-bars are suspended from special cross-bars so as to torni al grille upon `which the iuel rests. The cross-bars are so designed that the hanger-bars are maintained in the correct position to aitord the requisite amount of grate area. These crossba-rs are cast with parts which are alternately triangular and circular in cross-section, so as to be reversible and are provided with square extremities `which have beveled top edges and Which rest in cast iron supporting boxes built into the Walls ot' the turnace.

The boxes are made right and lett hand and tapered from front to back, having in addition two upstanding lugs on the top so that the boxes can be securely built into the furnace walls with the narrow end to the outside. The recesses in the 'boxes for the Specification of Letters `iatent.

Patented Mai-.16, ieee.'

Application filed April 25, 15H9. Serial No. 252,585.

cross-bars are deeper at one side to enable the cross bars to be inserted after the boxes are built in. The cross bars are then pulled toward the front ot the furnace and dropped into their inal position in the boxes, a vertical step in each. box preventing the crossbar from leaving' its position until its re mov-al is required.

Referring to the accompanying' drawings Figure l is a 4vertical sectional view of a furnace embodying the present improveA ments.

Fig. 2 and v y Fig. 3 a lvert-ical sectional view illustrating' the manner ot suspending the hanger bars from the cross-bars.

Fig'. 4c is a perspective vieivo'li part of a cross-bar showing the square ends, With beveled top edges ind alternate triangular and circular portions.

Fig. is an elevation, and

Fig. 6 a plan partly in section of a box for supporting the ends ot the cross bars.

Fig. 7 is an elevation, partly in section, oit the injector With. Venturi pipe and steam. connections, and

Fig. 8 is a plane of the Venturipipe shoiving the long radius `bend and mouthpiece.

The hanger-bars c. are constructed from hard cast-iron and are oi S shape. The upper portion c terms a hook (strengthened by tivo Webs c?) by means of vvhica the bar is suspended from the` cross bars The central portion of the hanger-bars is of convex shape in order that the fuel resting on the grate may be held a-vvay from the point ot attaclnnent ot the hook-end e. rlhe loiver end .3 oi the hanger-bar is made broader than the central portion and pro-` vided With a'iveb ai* for additional strength and is bent around, and this` end Wrapping' around the triangular portion of the crosslbar o, eii'ects a locking action which prevents the hanger-bars 'from'becoming disengaged during the process ot cleaning the fuel bed. On. the back of the hanger-bars is cast a. web o5, provided with two holes into which a Y-shaped 4bar may be inserted for the purpose ot removing the hanger-bar when. necessary.

The cross-bars Z) having the alternate round and triangular portions and b2 respectively, and also the beveled upper edges b3 on the box ends perform a double funcis a. halt-front view ot' the grate,

tion, while the lower end of the hanger-bar v engages with the base of the triangular portion of the supporting bar underneath land thus effects the locking action hereinbefore referred to'. At the saine tii'ne, while the hanger-bars a are locked while in their' working position, each one may at any time be 'unhoolred and removed with the aid of the Y-shaped bar by disengaging its lower end from the triangular portion of the crossbar by applying to such lower end a slightly forward movement.

ln Figs. 5 and 6 (Sheet 2) is shown a castiron box c designed for the left-hand side of 'the furnace. C is a step for keeping the cross-bar b in its position in the recess c2. The deeper recess 03 temporarily accommodates the end of the cross-bar when being put into position, and the inclined intermediate wall c4 between the recesses serves to guide the bar into position when the beveled edge 3 thereof engages with the said wall.

The introduction into the furnace of the primary air required for the combustion of the fuel is effected by means of two injectors7 one on each side of the furnace door built into the wall and discharging under Y the fuel bed, and using steam at any convenient pressure (according tothe adjustnient of the injectors) but preferabiy about l() lbs. per square inch.

Each injector consists of a cast-iron Venturi-pipe l with a long radius bend passing through the briclrworl ending in a mouthpiece Z directed rearward under the fuel bed and with a lip projecting clear of the bricliwork. Y l

rl"he inlet of the `Venturi pipe is partially closed by a flange Z2 screwed on to a nipple in a T-piece (Z3. i similar cored hole is provided on the bottoni ofthe Venturi pipe Vso that the latter can be used on either side Vof the furnace door, the cored hole not required being plugged od. d

The flange cl2 is adjustable on the screw nipple, the outer end of which is closed with a screw cap, and can be locked with a lock nut so as to leave any desired gap all around the edge kof the flange for admitting air into the Venturi pipe and around the liii-piece. The outlet of the T-piece is finished with a tapered nipple from which the steani is directed forward along the -Venturi pipe inducing a current of air which mingles with the steam and is .injected into the furnace.

, nlaving now described the nature of my invention, what l claim as new and desire to secure by Letters Patent of the United States is l. In a furnace of the class described, a grate including cross bars ar anged one above the other and formed with alternate round and triangular portions, and hanger bars having hoolr portions for engaging with the rounded portions of one bar and relatively angular portions for engaging with the triangular portion of the bar below.

Qln a furnace of the class described, a grate comprising cross bars having rect-angular end portions provided with opposite upper beve-,led edges, hanger bars adapted to engage with theV cross bars, boxes for receiving the rectangular ends of the cross bars and each including a chamber for initially receiving the end of the bar and a chamber for holding the bar in loclied position and each of said boxes being provided with a stepped shoulder between the bottoms of the chambers and with an inclined guide wall connecting the tops of said chambers.

ln a furnace of the class described, the combination with the furnace walls of bar receiving boxes held in said walls and each having an intermediate shoulder portion, cross bars having rectangular end portions Vfor itting in the boxes and being held in position by the respective shoulders, and' hanger bars connecting the cross bars.

l. in a furnace of the class described, a grate consisting of a plurality of cross bars arranged at different levels and in an inclined plane,hanger bars supported by the cross bars and each consisting of a body having a relatively round hook portion at one end for engaging with thercar side of one of the cross bars and having a relatively angular portion at its other end for engaging with the opposite side of a lower bar,

and means carried by the back of said hanger bars for receiving a withdrawing hoolr'.

ln testimony wlierof l have affixed my signature this first day of Japril7 1919.

ALl/VYNE MEADE. 

